The Mensa IQ test is a supervised admission test used by Mensa, the world's largest and oldest high-IQ society, to identify people who score in the top 2% of the population — the 98th percentile. There is no single "Mensa test" worldwide: each national group administers its own proctored admission test and also accepts prior evidence from a list of approved intelligence tests. What never changes is the bar — two standard deviations above the mean, a level reached by roughly 1 person in 50.
One thing to be clear about up front: IQ Revealed is not affiliated with Mensa, and our online assessment is not a Mensa admission test. It's a practice-style self-assessment using the same matrix-reasoning format many admission tests rely on — useful for seeing roughly where you stand before committing to a supervised session.
What Mensa actually is
Mensa was founded in Oxford, England in 1946 by barrister Roland Berrill and scientist-lawyer Lancelot Ware, with a simple premise: a society open to anyone whose IQ places them in the top 2%, regardless of background, politics or profession. Today Mensa International has national chapters in dozens of countries and well over 100,000 members worldwide. It is a social organization — local meetups, special interest groups on everything from chess to beekeeping, annual gatherings, and member publications. Membership is not a qualification or credential; it's a club whose only entry requirement is a test score.
The qualifying score: top 2% on an accepted test
Mensa's admission standard is a percentile, not a fixed number: you must score at or above the 98th percentile on an approved, supervised intelligence test. That means different qualifying numbers on different tests, which confuses a lot of applicants.
| Test | Standard deviation | Approximate qualifying score |
|---|---|---|
| WAIS (Wechsler Adult Intelligence Scale) | 15 | ~130–132 |
| Stanford-Binet 5 | 15 | ~130–132 |
| Cattell Culture Fair (Cattell B scale) | 24 | 148 |
Why the gap between 132 and 148? Both describe the same rarity. IQ scores are positions on a bell curve, and the standard deviation sets how spread out the numbers are. On an SD-15 scale like the WAIS, the 98th percentile sits about two standard deviations above the mean of 100 — roughly 130–132. The Cattell scale stretches the same curve with an SD of 24, so two standard deviations lands at 148. A Cattell 148 and a WAIS 132 are the same relative performance. This is why comparing raw numbers across tests is meaningless without knowing the scale — our guides to IQ percentiles and the IQ scale walk through the math in detail.
The Mensa Admission Test: what to expect
If you don't have a prior qualifying score, the standard route is a proctored admission test session organized by your national Mensa chapter. Formats vary by country, but a typical session (American Mensa's, for example) involves a battery of timed sections covering pattern recognition, logical reasoning, verbal and numerical problems, completed in roughly an hour under supervision. Some national groups use culture-fair, non-verbal tests built around matrix puzzles — abstract grids where you infer the rule and pick the missing piece, the same format described in our guide to how IQ tests work.
You register through your national chapter, pay a modest testing fee, and take the test at a scheduled venue with a proctor. Results arrive by mail or email a few weeks later. Note that scores from Mensa's own admission test are typically reported as pass/fail against the 98th-percentile bar rather than as a precise IQ number.
Online Mensa tests: practice, not admission
Mensa's websites offer online tests — the international Mensa Workout and various national online practice tests, some free and some paid. These are explicitly practice and entertainment tools: no online, unsupervised test can qualify you for membership, because there's no way to verify who took it or under what conditions. The same logic applies to every online IQ test, ours included. A well-built online assessment can give you a realistic estimateof where you'd land and excellent familiarity with the question formats — but the score that gets you into Mensa must come from a supervised session or an approved psychologist-administered test.
The prior evidence route
Already been tested? Most national Mensa groups accept documented scores from approved tests — commonly the WAIS, Stanford-Binet, and certain school- or military-administered cognitive tests — provided the test was administered and certified by a qualified professional, such as a licensed psychologist. You submit the official report, pay an evaluation fee, and if the score meets the 98th-percentile bar for that instrument, you're in without sitting Mensa's own test. Each national chapter publishes its list of accepted tests and qualifying scores; check yours before booking anything.
How to prepare
You can't study your way to a genuinely higher IQ in a few weeks — the evidence on that is covered honestly in how to increase your IQ. What you can do is remove everything that artificially lowers your score on test day:
- Get familiar with matrix puzzles. First-time takers lose points to unfamiliarity, not ability. Working through practice-style tests teaches you the common rule types — rotation, progression, addition/subtraction of elements — so you spend test time reasoning, not decoding instructions.
- Practice under time pressure. Admission tests are strictly timed. Train yourself to move on from a stuck question and bank the easier points.
- Sleep and schedule.Sleep deprivation measurably impairs working memory and attention. Book a morning slot if you're a morning person, sleep properly for several nights before, and skip the extra coffee that makes you jittery.
- Take a realistic practice run. A timed, matrix-based online assessment tells you approximately where you stand relative to the 98th-percentile bar before you pay for a proctored session.
Is membership worth it?
That depends on what you want from it. Members get local and national events, hundreds of special interest groups, journals and newsletters, and a ready-made social circle that enjoys puzzles and argument in equal measure. What membership does notdo is certify anything professionally — employers don't hire on Mensa cards, and a 98th-percentile score says nothing about the extreme claims you see in lists of the highest IQs ever recorded. For many members the honest answer is simpler: they took the test out of curiosity, passed, and stayed for the people.
The bottom line
Qualifying for Mensa means one thing: a supervised, approved test score at or above the 98th percentile — about 130–132 on an SD-15 scale, 148 on the SD-24 Cattell scale. Online tests, whether Mensa's own workout or a self-assessment like ours, are practice instruments that estimate your standing and build familiarity. If a realistic practice run puts you comfortably in the top few percent, booking a proctored session is a reasonable next step.